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Trane CGAE error code

I have a Trane CGAEC605AEA1DERM chiller. The unit has sat dormant for several years and now we are starting to try and bring it back on line. It all looks function and my service tech has been able to start it but it only runs for around 2 minutes then shuts down and displays "8A" which it says is the inlet water sensor. Is this what this code actually means? Is there any way of verifying that this is the problem that is shutting the unit down?

8A means 'Chilled Water Flow (Entering Water)'. That means the entering water temp fell below the leaving water temp by more than 2 degrees which indicates loss of chilled water flow. It also could be a bad sensor or loose connection to the sensor.

That code doesn't mean you have a bad sensor. There are several things that can cause that alarm and a bad sensor is just one of them. Your tech should be able to diagnose the problem. You don't just want to start replacing parts.

I don't understand why you would need to know where those sensors are located at so you can get the info for your tech. If he checked out your chiller and came to the conclusion you have a bad sensor, he should be well aware of what sensors they are.

look, I am not trying to fix this myself, all I am trying to do is save a bit of time so I can have the part here so he can put it in or so he can pick it up to put in, he is on other calls and is not available every minute of the day, he has other jobs to do. I have a machine down and is essentially going to shut down production so all I am asking for is a bit of help from professionals so I can speed the process up a bit, if that's all right.

I have a Trane CGAEC605AEA1DERM chiller. The unit has sat dormant for several years and now we are starting to try and bring it back on line. It all looks function and my service tech has been able to start it but it only runs for around 2 minutes then shuts down and displays "8A" which it says is the inlet water sensor. Is this what this code actually means? Is there any way of verifying that this is the problem that is shutting the unit down?

Here your asking if this is what the code means.

Originally Posted by R123

8A means 'Chilled Water Flow (Entering Water)'. That means the entering water temp fell below the leaving water temp by more than 2 degrees which indicates loss of chilled water flow. It also could be a bad sensor or loose connection to the sensor.

Here im telling you that is not what the code means and give you some direction where to check.

Originally Posted by R123

That code doesn't mean you have a bad sensor. There are several things that can cause that alarm and a bad sensor is just one of them. Your tech should be able to diagnose the problem. You don't just want to start replacing parts.

Again, im telling you there are other things to check

Originally Posted by e2zmaint

This is what he has narrowed it down to. All else seems to be OK

You said in your opening post you wanted to verify that was what the problem was.

the machine does have flow, the flow switch operates, I have physically watched it engage and disengage when we turn the machines' water pump on & off. We have a Johnson Controls A319 temp controller on our process water line, can't read the tag fully for the sensor it has, I don't know if this has anything to do with it.

I know this is difficult at the best of times, it is just that I was trying to help my tech out. The unit actually starts and runs for a couple minutes, but not long enough to read the freon pressures on either side of the compressor, and this "A8" error shows up. This machine probably has not run in 5 or 6 years so if I happen to replace a couple of parts that it may not need, at least they'll be new..